What this MCCB carries on the nameplate
The Siemens 3VA2225-6KP32-0AB0 is a SENTRON molded case circuit breaker built for line protection — 3-pole, 250 A continuous current, with a breaking capacity range from 375 A minimum up to 2 500 A maximum. At 240 V it interrupts 242 kA; at 415 V and 440 V that drops to 187 kA, then 121 kA at 500 V, and 4.5 kA at 690 V. That voltage-dependent SCCR curve tells you where this breaker is comfortable — it's sized for 480 V and below systems where the fault current stays within those numbers. Thermal derating is published from 40 °C through 70 °C: it holds 250 A flat up to 50 °C, then steps down to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. If your panel ambient runs above 50 °C, you need to account for that drop — the breaker doesn't magically shed heat in a tight enclosure. The operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. Maximum power loss hits 48 W, so factor that into your enclosure thermal budget — especially if you're stacking multiple breakers on the same DIN rail.
Integration and mounting
This breaker occupies 105 mm width on the DIN rail, 181 mm tall, 86 mm deep. The 3-pole footprint is standard for this class — it'll sit alongside other SENTRON 3VA frames without forcing a rail layout change. Two auxiliary switches HP come built in; no auxiliary release is fitted, so if you need a shunt trip or undervoltage release that's a separate add-on. Communication function is present, and it includes an 'other measurement function' — meaning it can talk to a higher-level system for monitoring, not just trip. No ground-fault monitoring version here, so if you need GF protection this isn't the variant.